BLUMEA 38 (1994) 335-348

Notes on Bulbophylunae() from Borneo

J.J. Vermeulen & A. Lamb

Summary

all and one ofthe Trias are described, originat- Nine new species of the genus

are ing from Borneo. Notes on two more Bornean species of Bulbophyllum given.

additional the informationon BorneanBulbophyllum species given This paper is to The Trias is in Vermeulen (1991). It adds nine new species to the checklist. genus

Two other Bulbo- recorded for the first time from Borneo, with one new species.

have been reduced into phyllum species are mentionedwhich appear to incorrectly

synonymy in Vermeulen (1991).

1. Bulbophyllum habrotinum J. J. Vermeulen & A. Lamb, spec. nov. (sect.

Cirrhopetalum) — Fig. 1

adaxialiter Bulbophyllum habrotinumJ.J. Vermeulen & A. Lamb, a B. makoyano in labello verru-

— Leiden cult. (De 913245 (L). coso differt. Typus: Vogel)

1-2.5 0.9-2.8 creeping, 2.5-3 mm diam.Pseudobulbs ovoid, cm apart,

Petiole 5-10 7- by 0.6-1.1 cm, somewhat flattened or not. mm. Leaf blade elliptic,

index obtuse. 4.5-9 20 by 2-3 cm, 3.5-10, tip Inflorescence usually single, cm, 8 Rhachis 6-9-flowered. Peduncle 4.3-8.7 cm; bracts c. 4, the longest c. mm.

Floral bracts 4-5 Pedicel and nodding, 0.2-0.3 cm. ovate, mm, tip acute. ovary

Flowers in all the little 6-7 mm. pendulous, a whorl, open at same time, opening.

3.5-4 index often Median elliptic, 4.2-4.5 by mm, 1.1-1.3, tip acuminate,

rather thin; surface Lateral with a terminal hair; margins long ciliate; glabrous.

well their lower in the basal connate along their upper margins as as along margins rather third, obliquely ovate, 26-55 by 3-3.5 mm, index c. 9-16, tip subacute;

thin; about glabrous. Petals obliquely ovate, 4-4.5 by 2-2.5 mm, index 1.8-2, tip rather acuminate, often with a terminal hair; margins long ciliate; thin; adaxially very

finely papillose towards the tip; abaxially glabrous. Lip curved halfway, general

index 1.7-2 acute to outline ovate, 3.2-4 by 1.8-2 mm, (not spread), tip shortly

towards the rather acuminate; margins finely erose, papillose tip; thin, soft; adaxially

with median with 2 distinct conver- concave near the base, an inconspicuous ridge,

of its towards the base small lobes, gent ridges over most length, protruding as sur- face papillose towards the base, verrucate towards the margins elsewhere; abaxially

1 ) Rijksherbarium/Hortus Botanicus, P.O. Box 9514, 2300 RA Leiden, The Netherlands. 2 ) Agricultural Research Station, P.O. Box 197, Tenom, Sabah, Malaysia. 336 BLUMEA Vol. 38, No. 2, 1994

Fig. 1. Bulbophyllum habrotinum J.J. Vermeulen & A. Lamb. a. Flower; b. lip, adaxial side;

d. column and lip, lateral view (Leiden cult. 913245). — Fig. 2. B. trulliferum J.J. Vermeulen &

A. Lamb. a. Flower analysis, from left to right: median sepal, petal, lateral sepal, lip; b. lip, adaxial side; c. column and lip, lateral view (T. O. C. cult. 2321). — Fig. 3. B. gilvum J.J. Vermeulen & A. d. lateral view ( Vermeulen Lamb. a. ; b. lip, adaxial side; column and lip, 569). J.J. Vermeulen & A. Lamb: Bulbophyllinae from Borneo 337

with median surface Column from the a distinct, retuse ridge, glabrous. ovary to tip

ofthe stelidia c. 2 mm; stigma not protruding at its base, slit-like; column foot with-

out accessories. Stelidia deltoid, c. 0.5 mm; tip acute; with a distinct, deltoid, acute

with towards tooth along the upper margin. Anther abaxially an inconspicuous ridge

its tip; front margin protruding. Pollinia 4; the innerpair more than half as long as the

outer pair. Stipes absent.

Colours - Peduncle pale red, bracts pale green, sometimes with a pink tinge.

Pedicel orange red, ovary yellow with red stripes. Median sepal dark red. Lateral se- Petals pals yellow, mottled with dark red, dark red towards the top. yellowish green,

brown. veins and top dark red. Lip yellow, suffused with some

Distribution - Malaysia: Sabah, Interior Zone: Crocker Range near Tambunan,

Lamb 1337/91 (L). Indonesia: Kalimantan, Kalimantan Timur, Apo Kayan, Leiden

cult, (de Vogel) 913245(L).

Ecology - Epiphyte in primary forest. Alt. 1000-1500m asl. Flowering observed

in March.

Notes - Differs from B. makoyanum (Reichb. f.) Ridley in having a lip which is

verrucose adaxially. In addition, it has lateral sepals which are not covered with a

the flowers and which their sticky mucus when are open, are only connate along

the base. lower margins near

The name refers to the elegandy shaped flowers: 'habros' (Greek) meaning 'deli-

cate'.

2. Bulbophyllum trulliferum J. J. Vermeulen & A. Lamb, spec. nov. (sect.

Hirtula) — Fig. 2

Bulbophyllum trulliferum J.J. Vermeulen & A. Lamb, a B. nigrescenti in inflorescentia nutanti, petalis triangularibus differt. — Typus: T. O. C. cult. 2321 (L).

Rhizome creeping, 1.8-2.5 mm diam.Pseudobulbs almost discoid, 0.6-1 cm apart,

0.4-0.7 by 1.2-2 cm, distinctly dorsoventrally flattened. Petiole c. 10 mm. Leaf blade elliptic, 8.5-17 by 0.8-1.2 cm, index 10-14.2, tip acute. Inflorescence

29-32 10-14-flowered. 27-29 bracts the usually single, cm, Peduncle cm; c. 5,

longest c. 5 mm. Rhachis nodding, 2-3 cm. Floral bracts ovate, 1 mm, tip acute.

Pedicel and 2.5-3 node with the attachment of the floral ovary mm, coinciding

bract. Flowers scattered, many open simultaneously, little opening. Median sepal

rounded ovate, 3-3.2 by 2-2.6 mm, index 1.2-1.5, tip to obtuse; margins ciliate; rather thin; adaxially glabrous, abaxially hirsute. Lateral sepals oblique, 3-3.8 by

2-3 mm, index 1.3-1.5, tip obtuse; margins papillose; otherwise as the median

sepal. Petals oblique, triangular, 1.5-2.5 by 0.5-0.7 mm, index 3-3.6, tip sub- acute; margins long ciliate; thin; surface glabrous. Lip distinctly curved halfway,

constricted general outline obovate, somewhat halfway, 2-2.5 by 1.1—1.2 mm,

ciliate index 1.9-2.1 (not spread), tip rounded; margins long and with a backwards

pointing, subulate auricle near the attachmentto the column; thick; adaxially concave

near the base, with 2 short ridges continuing as a slight median depression which

is flanked by 2 more rather distinctridges, and which ends as a circular depression

near the top of the lip, surface glabrous; abaxially without a median ridge, surface

hairs. Column from towards the margins with thick long ovary to the tip of the 338 BLUMEA Vol. 38, No. 2, 1994

stelidia c. 1.6 mm; stigma protruding at its base, triangular; column foot without

Stelidia 1 with accessories. narrowly triangular, c. mm; acute; a small, deltoid, ob-

tooth the and much tooth of similar tuse along upper margin a larger shape along the

lower margin. Anther abaxially without a ridge; front margin not protruding, with

stiff hairs. Pollinia 4; the innerpair more than half as long as the outer pair. Stipes

absent.

Colours - Sepals cream-coloured, suffused with pale purple. Petals white, vein,

margin and hairs along the margin purple. Lip orange towards the base, blackish

the hairs white. purple towards top;

Distribution - Malaysia: Sabah, Interior Zone: Crocker Range near Tenom, Lamb

830/87 (K), T.O.C. cult. 2321 (L), T.O.C. cult. 2429.

Ecology - Epiphyte in primary forest. Alt. c. 900 m asl. Flowering observed in

Sept.

Notes - 1. Shares a concave top part of the tip with B. nigrescens Rolfe. It differs

from that species in having a nodding rhachis, triangular (not spathulate) petals, as

well as much longer and narrower stelidia.

2. The name refers to the shape of the lip: 'trulla' meaning 'spoon' inLatin.

3. J. J. Vermeulen & A.Lamb, Bulbophyllum gilvum spec. nov. (sect. Lepto-

pus) — Fig. 3

Bulbophyllum gilvum J.J. Vermeulen & A. Lamb, a B. tenuifolio pseudobulbis dense aggregatis,

labello recurvato differt. — Typus: Vermeulen 569 (L).

0.8 diam. 0.08-0.2 0.15- Rhizome creeping, c. mm Pseudobulbs ovoid, cm apart,

0.5 0.08-0.18 flattened.Petiole 0.5-1 blade 1.5- by cm, hardly mm. Leaf elliptic,

3.4 by 0.3-0.35 cm, index 5-10, tip acute. Inflorescence usually few together on a

short sympodium, 2-3 cm, 1-flowered. Peduncle 1-1.8 cm; bracts 2, the longest 1-

1.8 mm. Floral bracts tubular, 1-1.5 mm, tip acute. Pedicel and ovary c. 8 mm, with

the node c. 0.6 mm from the floral bract. Flowers moderately opening. Mediansepal

ovate, c. 6.3 by 2.2 mm, index 2.8-2.9, tip acute; rather thin; glabrous. Lateral se-

6.7 2.4 index otherwise the median pals oblique, c. by mm, c. 2.8; as sepal. Petals

2.2 1.2 index obliquely obovate, c. by mm, 1.8-1.9, tip obtuse; margins finely pa-

surface outline pillose; thin; glabrous. Lip curved halfway, general ovate, c. 3.2 by

1.2 mm, index 2.6-2.7 (not spread), tip rounded; margins partially papillose in the

lower half of the lip, otherwise glabrous; rather thick; adaxially concave and with 2

convergent ridges near its base, elsewhere slighdy convex, surface glabrous; abaxi-

ally with an inconspicuous, truncate median ridge near the base, surface with a trans-

verse papillose band in the basal half. Column from ovary to the tip of the stelidia

c. 1.3 mm; stigma not protruding at its base, obovate; column foot with small lateral

wings close to the attachment of the lip. Stelidia narrowly triangular, c. 0.9 mm; tip

acute. Anther abaxially with a ridge towards its tip; front margin protruding. Pollinia

the inner half thin. 4; pair more than as long as the outer pair. Stipes present,

Colours - Flowers yellow. Lip sometimes with some purple along the margins

and in the centre on the abaxial side.

Distribution - Malaysia: Sabah, InteriorZone: Ulu Padas, near Long Pa Sia, Ver- meulen 596 (L), Vermeulen & Duistermaat 1022 (L), 1036 (L). J.J. Vermeulen & A. Lamb: Bulbophyllinae from Borneo 339

Ecology - An epiphyte on mossy trunks and branches of small trees in low and

Oct., open, very wet, mossy podzolic forest. Alt. 1300-1600m asl. Flowering Dec.

Notes - 1. Similar to some forms of the variable species B. tenuifolium (Blume)

well dis- Lindl. It differs in having more closely packed pseudobulbs, as as a more

curved of tinctly lip a firm, not a very spongy, texture.

2. The name refers to the yellowish flowers: 'gilvum' (Latin) meaning 'pale yel-

low'.

4. Bulbophyllum lohokii J. J. Vermeulen & A. Lamb, spec. nov. (sect. Hapa-

lochilus) — Fig. 4

Bulbophyllum lohokii J.J. Vermeulen & A. Lamb, a B. aureoapaci in rhizomate repente et petalis

ellipticis, a Bulbophylli sect. Leptopodis speciebus borneensibus labello immobiliter affixo differt.

— Typus: Lamb 569/86 (L).

Rhizome creeping, 1.5-2 mm diam. Pseudobulbs ovoid, 0.7-1.2 cm apart, 0.8-2

0.5-0.9 flattened. Petiole 0.5-2 blade by cm, hardly mm. Leaf elliptic, 2-6 by

0.8-1.4 cm, index 2-4, tip acute. Inflorescence usually some together on a short

Peduncle 2.5-4.5 bracts 5 the sympodium, 3-5 cm, 1-flowered. cm; or 6, longest

bracts 1.8-2.5 acuminate. Pedicel and 2.5-3 mm. Floral tubular, mm, tip acute to

14-18 with the node 0.8 from the floral bract. Flowers ovary mm, c. mm widely

opening. Median sepal ovate, 10.5-13 by 3-4 mm, index 2.5-4.3, tip acute to

acuminate; margins finely papillose; thin; surface glabrous. Lateral sepals obliquely

ovate, 10-13 by 3.2-3.5 mm, index 3-4, margins only little papillose; otherwise

as the median sepal. Petals elliptic, 4-5.8 by 1.2-2 mm, index 2.9-4.3, tip acu-

minate; margins finely papillose near the tip; thin; surface glabrous. Lip firmly fused

to the column-foot, immobile, 3-lobed, median lobe approximately straight, general

8-10.5 1.6-2.4 index 2.9-4.3 rounded outline obovate, by mm, (not spread), tip

to subacute; margins glabrous; thick but very soft; adaxially concave near the base,

convex towards the tip, surface glabrous; abaxially without a median ridge, surface

papillose halfway towards the margins; laterallobes inserted near the base of the Up,

Column pointing backwards, triangular, tip obtuse; thin; glabrous. from ovary to the

tip of the stelidia 2-2.3 mm; stigma protruding at its base, slit-like; columnfoot with two small lateral wings close to the attachmentof the lip. Stelidia subulate, 0.5-0.7

with obtuse tooth the Anther mm; tip acute; an inconspicuous, along upper margin. abaxially with a ridge towards its tip; front margin not protruding. Pollinia 4; the inner pair more than half as long as the outer pair. Stipes absent.

Colours - Sepals and petals yellowish or translucent white, with dark purple blotches. sometimes with few Lip yellow, a tiny purple specks.

Distribution - Malaysia: Sabah, West Coast Zone and Interior Zone: Mt Kinabalu,

Carr SFN 27564 (L), Phillips SNP 2393 (L), Vermeulen & Chan 398 (L); Crocker

Range near Tambunan, Lamb SAN 92317 (K), Vermeulen 651 (L).

Ecology - Epiphyte in forest, usually on small branches near the forest floor. Alt.

1700-2000 m asl. Flowering March, June, July, Sept., Oct.

- 1. Notes This species belongs to sect. Hapalochilus, of which most species oc-

cur in New Guinea. The flowers are similar B. Schltr., which, most to aureoapex however, has a patent rhizome and distinctly ovate petals. 340 BLUMEA Vol. 38, No. 2, 1994

Fig. 4. Bulbophyllum lohokii J.J. Vermeulen & A. Lamb. a. Plant; b. flower; c. flower analysis,

left to from right: median sepal, petal, lateral sepal, lip; d. lip, adaxial side; e. lip, abaxial side; f. column and lateral left adaxial abaxial h. left: lip, view; g. anther, side, right: side; pollinia, one pair, right: two pairs (Lamb 459/86). J.J. Vermeulen & A. Lamb: Bulbophyllinae from Borneo 341

2. This is the first species of sect. Hapalochilus found on Borneo. More or less

such similar looking species, as B. crepidiferum J.J. Smith (sect. Leptopus) differ

in having a mobile lip.

3. Named after Mr. H. Lohok, curator of the orchid garden at Poring, Sabah.

5. Bulbophyllum lordoglossum J. J. Vermeulen & A. Lamb, spec. nov. (sect.

Hybochilus ) — Fig. 5

Bulbophyllum lordoglossum J.J. Vermeulen & A. Lamb, intra sect. Hybochilum labello elliptico

basi adaxialiter carina mediali brevissima omato notata. — Typus: Vermeulen 900 (L).

0.8 diam. 0.7-1.4 Rhizome creeping, c. mm Pseudobulbs ovoid, cm apart, 0.1-0.8

by 0.08-0.12 cm, not flattened. Petiole 0.2 mm. Leaf blade elliptic, 0.5-0.9 by

0.3-0.4 index 1- cm, 1.6-2.5, tip acute. Inflorescence usually single, c. 0.6 cm,

flowered. Peduncle c. 0.2 cm; bracts 3, the longest c. 0.9 mm. Floral bracts tubular,

c. 1 mm, tip acuminate. Pediceland ovary c. 1.8 mm, with the node c. 0.4 mm from

the floral bract. Flowers moderately opening. Median sepal ovate, c. 2.8 by 1.2 mm,

Lateral index 2.3-2.4, tip subacute; thin; glabrous. sepals obliquely triangular, c. 2.7

1.5 index otherwise the median Petals 1.1 0.7 by mm, c. 1.8; as sepal. elliptic, c. by

mm, index 1.5-1.6, tip emarginate; very thin; glabrous. Lip distinctly curved about

halfway, general outline elliptic, c. 1 by 0.7 mm, index 1.4-1.5 (not spread), tip

rounded; margins with elongated papillae except near the base; rather thin; glabrous

but slightly papillose towards the margins; adaxially somewhat concave except near

the top, with a rather distinct, short median ridge near the base; abaxially without a

median ridge. Column from ovary to the tip of the stelidia c. 1.4 mm; stigma not

protruding at its base, elliptic; column foot without accessories. Stelidia narrowly

triangular, c. 1.1 mm; tip acute. Anther abaxially with a slight ridge towards its tip;

front margin not protruding. Pollinia (not seen).

Colours - Sepals white, the laterals with a dark red blotch in the centre. Petals

white. Lip dark red. Column white.

Distribution - Sandakan Zone: Malaysia: Sabah, Tawai Plateau near Telupid, Ver-

meulen 900 (L).

Ecology - Found as an epiphyte on a small branch near the forest floor, in forest

on ultrabasic rock. Alt. 700 m asl. Flowering observed in Nov.

Note - This species is probably best included in sect. Hybochilus. Within this section, it is well characterized by its wide elliptic lip, with only a very short median ridge near its base. The name refers to the distinctly recurved lip: 'lordos' (Greek):

'bentbackwards'.

6. J. J. Vermeulen & A. Lamb, Bulbophyllum tryssum spec. nov. (sect. Hybo-

chilus) — Fig. 6

Bulbophyllum tryssum J.J. Vermeulen & A. Lamb, a B. lordoglosso in labelli carina mediali, la- bello basi utrimquetuberculis omato differt. — Typus: Vermeulen 508 (L).

Rhizome creeping, c. 0.4 mm diam. Pseudobulbsellipsoid to spherical, 0.3-1.2 cm apart, 0.13-0.2 by 0.1-0.15 cm, not flattened. Petiole c. 0.5 mm. Leaf blade ovate 342 BLUMEA Vol. 38, No. 2, 1994

Fig. 5. Bulbophyllum lordoglossum J.J. Vermeulen & A. Lamb. a. Plant; b. flower analysis, from left to right: median sepal, petal, lateral sepal, lip; c. lip, adaxial side; d. column and lip, lateral view (Vermeulen 900). —Fig. 6. B. tryssum J.J. Vermeulen & A. Lamb. a. Flower analysis, from left to right: median sepal, petal, lateral sepal, lip; b. lip, adaxial side; c. column and lip, lateral

& A. b. view ( Vermeulen 508). — Fig. 7. B. hemiprionotum J.J. Vermeulen Lamb. a. Plant; lip, Vermeulen adaxial side; c. column and lip, lateral view ( 467). J.J. Vermeulen & A. Lamb: Bulbophyllinae from Borneo 343

to elliptic, 0.35-1.5 by 0.18-0.4 cm, index 2.5-5, tip acuminate. Inflorescence

0.7-1.4 Peduncle usually single, c. cm, 1-flowered. 0.4-0.8 cm; bracts 1 or 2,

Floral bracts 0.8-1.2 acuminate. Pedicel and 1-1.5 mm. tubular, mm, tip acute to

1-2 with the node 0.3-0.8 from the floral bract. Flowers ovary mm, mm widely

3-6 0.9-1.6 index opening. Median sepal ovate, by mm, 3.7-4.5, tip acuminate;

thin; glabrous. Lateral sepals obliquely triangular, 3-6.2 by 1-1.8 mm, index 3.4-

4.5; otherwise as the median sepal. Petals obliquely ovate, c. 1.5-3 by 0.5-1 mm,

index c. 5, tip acute; margins slightly erose towards the tip; thin; surface glabrous.

Lip curved near the base, general outline triangular, 2-3.5 by 0.5-0.7 mm, index

surface 4.2-5 (not spread), tip subacute; margins ciliate; rather thin; very finely

papillose; adaxially somewhat concave near the base, with a distinct median ridge

from the base to the tip, with 2 more distinct, short ridges near its base, close to the

median without median Column from the ofthe ridge; abaxially a ridge. ovary to tip

stelidia 0.5-0.8 mm; stigma slightly protruding at its base, elliptic; column foot

without accessories. Stelidia triangular, c. 0.4 mm; tip obtuse; with a distinct, trian-

gular, obtuse tooth along the upper margin. Anther abaxially with a ridge towards its tip; front margin slightly protruding. Pollinia 2. Stipes absent.

Colours - translucent bronze white Sepals and petals pale green. Lip green, with

midvein often Column white. ciliae, bright green. Distribution - Malaysia: Sabah, West Coast Zoneand InteriorZone: Crocker Range

near Kimanis, Vermeulen 508 (L); Sandakan Zone: Tawai Plateau near Telupid, Ver-

meulen & Lamb 733 (L), Vermeulen 866 (L); Kuamut Highlands, Maliau Basin,

Lamb 1487/92 (L). Indonesia: Kalimantan, Kalimantan Timur: Apo Kayan, de Vogel

& Cribb 9215 (K, L).

- trunks and branches Ecology Epiphyte on near the forest floor. Alt. 400-1600 m

asl. Flowering observed in Oct., Nov.

Notes - 1. Collection de Vogel & Cribb 9215, Kalimantan, has shorter petals and

a relatively short and wide lip. Otherwise it does not differ from the other specimens.

2. This species belongs to sect. Hybochilus. The general habitis similarto B. lor-

doglossum. Within this section it is well characterized by the long median ridge on the lip, which is flanked at the base by two knobs. The name refers to the delicate shape of this species: 'tryssos' (Greek): 'delicate'.

7. Bulbophyllum hemiprionotum J. J. Vermeulen & A. Lamb, spec. nov. — Fig. 7

Bulbophyllum hemiprionotumJ.J. Vermeulen & A. Lamb, stelidiorum absentia, stigmatis basi

tuberculo basi labeili adaxialiter tuberculis duobus — Ver- magno ornata, provisa notata. Typus: meulen 467 (L).

0.7-1 diam. Pseudobulbs 0.8-2.5 0.2- Rhizome creeping, mm ovoid, cm apart,

0.6 by 0.2-0.4 cm, hardly flattened. Petiole 0.5-1.5 mm. Leaf blade ovate, 0.9-3 by 0.5-1.3 cm, index 1.5-5, tip acuminate. Inflorescence usually single, 2.5-3

1-flowered. Peduncle 1.2-2.2 cm, cm; bracts 1-3, the longest 1.5-3 mm. Floral bracts 1.8-2 acuminate. Pedicel and tubular, mm, tip ovary c. 9-11 mm, with the node0.8-1.5 mm from the floral bract. Flowers moderately opening. Median sepal

10-14 ovate, by 2-2.8 mm, index 4.3-7, tip (sub)acute; rather thin; thickened to 344 BLUMEA Vol. 38, No. 2, 1994

the Lateral wards tip; glabrous. sepals ovate to triangular, 10-14 by 2-3.3 mm,

index the median Petals 3.5-4 0.6-1 in- 3.6-5, otherwise as sepal. ovate, by mm,

dex 3.6-6, tip (sub)acute; thin; glabrous. Lip curved halfway, general outline ellip-

index 2.5-3 tic, 2.5-3 by 1 mm, (not spread), tip rounded; margins papillose or

dentate to slightly over halfway the lip, rather thick; adaxially concave towards the

base, with two distinct knobs which together form a transverse ridge near the base,

towards the surface somewhat papillose margins; abaxially without a median ridge,

Column from the of surface glabrous. ovary to tip the stelidia 1-1.5 mm; stigma dis-

tinctly protruding at its base, obovate; column foot without accessories. Stelidia in-

rounded with distinct conspicuous, wings not protruding beyond rostellum, a acute

the lower Anther with front tooth along margin. abaxially a ridge; margin not pro-

truding. Pollinia4; the inner pair less than halfas long as the outer pair. Stipes absent.

Colours - Sepals white or greenish, usually with purple veins, tip green or pur-

ple. Petals white with a purple vein. Lip yellowish green, usually with purple mar-

gins, top sometimes yellow. Column white.

- Distribution Malaysia: Sabah, West Coast Zone: Mt. Kinabalu, Clemens 34107

Lamb 743/87 Vermeulen 467 Lamb (BO, E, NY), (L), (L), Vermeulen, van Welzen &

1329 (L); Interior Zone: Ulu Padas, near Sarawak border, Vermeulen 613 (L).

Ecology - Epiphyte on trunks and branches near the forest floor. Observed in

mixed high forest and in mossy, low and open forest with many rattans. Alt. 1700-

2000 m asl. Flowering Jan., March, July, Sept., Oct.

Notes - 1. Characterized by the column which lacks stelidia and has a large knob

at the base of the stigma, as well as by the two knobs near the base of the lip.

2. Difficult to place in any section. The shape of the column is reminiscent of

species of sect. Macrouris (mainly occurring on New Guinea), but species of this

section have racemose inflorescences in most cases.

3. refers The name to the partially dentate Up: 'hemi' (Greek), meaning 'half', and

'prionotos' meaning 'serrate'.

8. Bulbophyllum dibothron J.J. Vermeulen& A. Lamb, spec. nov. (sect. Moni-

libulbus) — Fig. 8

dibothron Vermeulen lambii Bulbophyllum J.J. & A. Lamb, a B. in petalis obovatis, labello in parte basali adaxialiter duabus carinis ornato differt. — Typus: Jongejancult. 1956 (L).

0.6-0.8 diam. the Rhizome creeping, mm Pseudobulbs prostrate on rhizome, ovoid, touching, 0.2-0.5 by 0.2-0.3 cm, distinctly flattened. Petiole 0.8-2 mm. Leaf blade elliptic to obovate, 0.5-1.3 by 0.3-0.6 cm, index 1.6-2.1, tip acute. Inflo- rescence usually single, 3.5-5.5 cm, 1-flowered. Peduncle 2-3.5 cm; bracts 2 or

3, the longest c. 2 mm. Floral bracts tubular, 1.5-2.5 mm, tip acuminate. Pedicel and 10-13 with the 0.5-1.5 from floral ovary mm, node mm the bract. Flowers widely opening. Median sepal ovate to elliptic, 7 by 2-2.7 mm, index 2.6-3.5, tip

Lateral 7-11 2.2-4 index acuminate; thin; glabrous. sepals oblique, ovate, by mm,

Petals 3-4 0.8-1.2 index 2.5-3.2, tip (sub)acute; thin; glabrous. obovate, by mm,

3.1-3.9, tip acuminate; margins erose towards the tip; thin; surface glabrous. Lip somewhat curved, clawed, general outline ovate with a drawn-out top part, 9-11 by

index 5 the 1.8-2.2 mm, c. (not spread), tip obtuse; margins erose-dentate in J.J. Vermeulen & A. Lamb: Bulbophyllinae from Borneo 345

surface basal half, but glabrous close to the base; rather thin; glabrous; adaxially con-

in the with median close the base and cave basal half, one deeper depression to a sec-

ond at about one third of the lip, with 2 distinct parallel ridges with an erose crest in

the basal without median Column from the of the half; abaxially a ridge. ovary to tip

stelidia 2.8-3 mm; stigma not protruding at its base, obovate; column foot with a

rounded central swelling close to the attachment of the lip. Stelidia triangular, 0.8-1

with towards its front mm; tip acute. Anther abaxially an inconspicuous ridge tip;

lacerated. margin not protruding. Pollinia 2. Stipes present, thin,

Colours - Peduncle and pedicel brownish yellow. Floralbract white. Ovary green.

with veins. Petals translucent with vein. Sepals yellowish orange pale yellow orange

with its drawn-out Lip yellow a greentinge near base, orange up to halfway, top part

white. Column greenish with an orange foot.

Distribution - Malaysia: Sabah, West Coast Zone/InteriorZone: Mt Kinabalu,

Crocker Vermeulen, van Welzen & Lamb 1330 (L); Range near Tambunan,Jongejan

cult. 1956(L), Lamb 1294/91 (L).

- branches in forest. Alt. 1500- Ecology Epiphyte on tree trunks and montane

2000 m asl. Flowering observed in Jan.

Notes - 1. Differs from B. lambii J.J. Vermeulen in having obovate (not spathu-

well in the late) petals, and a lip with a distinctly drawn-out top part, as as two ridges

basal part (rather than scattered irregular teeth).

2. The name refers to the two depressions in the basal half of the lip: 'bothros'

(Greek) meaning 'a hollow'.

9. Bulbophyllum muscohaerens J.J. Vermeulen & A. Lamb, spec. nov. (sect.

Polyblepharon) — Fig. 9

Bulbophyllum muscohaerens J.J. Vermeulen & A. Lamb, a B. tortuoso labello lineari basaliter tu-

berculo omato differt. — Typus: Vermeulen 647 (L).

30 cm c. 1 mm diam. Pseudobulbs Rhizome pendulous, up to long, Roots spreading.

1.5-2.3 0.5-0.6 0.2-0.3 somewhat flattened. Petiole ovoid, cm apart, by cm,

c. 0.5 mm. Leaf blade ovate, 1.5-2.2 by 0.6-0.9 cm, index 2.4-2.5, acuminate.

Inflorescence few together on a short sympodium, 0.7 cm, 1-flowered. Peduncle

bracts acuminate. 0.2 cm; bracts 3, the longest 1.5 mm. Floral tubular, c. 1.5 mm, tip

Pedicel and 1.5 with the node 0.5 from the floral bract. Flowers ovary mm, mm

4.5 1.7 index sub- moderately opening. Median sepal ovate, c. by mm, 2.6-2.7, tip

acute; thin, slightly thickened towards the tip; glabrous. Lateral sepals adherentalong

their lower margins over most of their length, obliquely triangular, c. 4.3 by 1.7 mm,

index 2.5-2.6; otherwise as the median sepal. Petals about obliquely ovate, c. 1.5

by 0.5 mm, index c. 3, tip acute; thin; glabrous. Lip somewhat curved halfway, gen-

index7-8 eral outline ovate, c. 2.7 by 0.35 mm, (not spread), tip rounded; margins

surface with dis- ciliate except in the basal third; rather thick; glabrous; adaxially a

tinct conical knob near the base, otherwise convex; abaxially without a median ridge.

stelidia 1 its Column from ovary to the tip of the c. mm; stigma not protruding at base, elliptic; column foot without accessories. Stelidia triangular, c. 0.5 mm; tip

towards its front Pol- acute. Anther abaxially with a ridge tip; margin not protruding.

linia 4; the inner pair less than half as long as the outer pair. Stipes absent. 346 BLUMEA Vol. 38, No. 2, 1994

Fig. 8. Bulbophyllum dibothronJ.J. Vermeulen & A. Lamb. a. Plant; b. flower; c. lip, adaxial side; d. column, lateral view (Jongejancult. 1956).— Fig. 9. B. muscohaerens J.J. Vermeulen & A. Lamb. a. Plant; b. lip, adaxial side; c. column and lip, lateral view ( Vermeulen 647).— Fig. 10. Trias antheae

J.J. Vermeulen & A. Lamb. a. Flower analysis, from left to right: median sepal, petal, lateral sepal, lip; b. lip, adaxial side; c. column and lip, lateral view; d. anther, adaxial side (T.O.C. cult. 2600). J.J. Vermeulen & A. Lamb: Bulbophyllinae from Borneo 347

Colours - Sepals white towards the base, purple or green towards the tip. Petals

midvein. dark translucent white, often with a purple Lip purple.

Distribution - Malaysia: Sabah, Interior Zone: Crocker Range near Tambunan, Ver-

Sarawak Vermeulen form meulen 647 (L); Ulu Padas near border, 612, peloric (L).

- Found 2 m above the forest floor. Ecology on a mossy treetrunk, approximately

Alt. 1800-2000m asl. Flowering observed in Oct.

down Notes - 1. Bulbophyllum muscohaerens grows hanging along mossy tree-

towards the where the is trunks. Its roots do not grow along the rhizome point plant

with attached to the substratum (as in many other Bulbophyllum species a hanging

towards the substrate. The name refers rhizome), but grow away from the plant, to

this character: 'muscohaerens' (Latin) meaning 'clinging to moss'.

2. The species belongs to section Polyblepharon. It differs from the sympatric B.

tortuosum (Blume) Lindl. in having a long linear lip with a distinctknob near the base.

10. Bulbophyllum tardeflorens Ridley (sect. Intervallatae)

Bulbophyllum tardeflorensRidley, J. Linn. Soc. 31 (1896) 276. —Type: Singapore cult. s.n. (SING,

not seen).

with Note - In Vermeulen (1991: 153) B. tardeflorens is incorrectly synonymized

differs B. macrochilum. Two different taxa are involved. Bulbophyllum tardeflorens

from B. macrochilum in having longer with smaller, widely spaced pseu-

dobulbs.

11. Bulbophyllum megalanthum Griff. (sect. Sestochilus)

Bulbophyllum megalanthumGriff., Notul. 3 (1851) 286. — Typus: Griffith s.n. (K).

Note - In Vermeulen(1991: 247) B. megalanthum is incorrectly synonymized with

B. cheiri. Two different taxa are involved. Bulbophyllum megalanthum differs from

B. cheiriin having rhizome bracts which leave persistent fibres around the rhizome,

rounded the back. The flowers also dif- as well as in the lip which is distinctly on are

brownish ferently coloured: the sepals are yellowish or with conspicuous purple spots.

— 10 12. Trias antheae J.J. Vermeulen & A. Lamb, spec. nov. Fig.

Trias antheae J.J. Vermeulen & A. Lamb, a T. intermedia in labelli lobis lateralibus minoribus,

— T. O. C. cult. 2600 (L). columnae secus margines inferiores alis rotundatis differt. Typus:

1.5 diam. 0.8-1.5 0.9 Rhizome creeping, c. mm Pseudobulbs ellipsoid, cm apart, c.

0.8 flattened.Petiole about absent. blade 1.8-2.3 by cm, distinctly Leaf elliptic, by

1.1 index rounded. 1.8 1- cm, 1.8-2.1, tip Inflorescence usually single, c. cm,

3.5 Floral bracts flowered. Peduncle c. 0.5 cm; bracts 3, the longest mm. tubular,

Pedicel and 6 node with the attach- c. 2 mm, tip acuminate. ovary c. mm, coinciding

ment of the floral bract. Flowers widely opening. Median sepal ovate, c. 7.5 by 7.5

index rather Lateral 8 7 in- mm, c. 1, tip apiculate; thin; glabrous. sepals c. by mm,

Petals about 4.5 2.5 dex c. 1.4; otherwise as the median sepal. triangular, c. by mm,

median lobe index c. 1.8, tip acute; thin; glabrous. Lip 3-lobed, curved, general out 348 BLUMEA Vol. 38, No. 2, 1994

line ovate, c. 4.5 by 3 mm, index c. 1.5 (not spread), tip rounded; margins glabrous;

the thick; adaxially concave towards base, convex towards the tip, surface slightly

verrucate; abaxially with retuse median ridge, surface glabrous; lateral lobes along

third of the small and the margins in the lower lip, very inconspicuous, triangular, tip

acute. Column from ovary to the tip of the stelidia c. 2.5 mm; stigma not protruding

at its base, reniform, column foot without accessories. Stelidia inconspicuous, del-

0.5 with rounded toid, c. mm; tip acute; upper margin erose; a broadly wing along

the lower margin. Anther abaxially with a ridge which is deeply bifurcate at its tip and which distinctly protrudes beyond the front margin; front margin not protruding.

than absent. Pollinia 4; the inner pair more halfas long as the outer pair. Stipes

Colours - Flowers cream-coloured, with some purple.

Distribution - Malaysia: Sabah, Interior Zone: Nabawan, T. O. C. cult. 2600 (L).

Ecology - Found as an epiphyte on a branch in wet podzolic forest. Altitude c. 400 m asl.

Notes - 1. Similar to T. intermedia Seidenf. & Smitin., from Thailand. Trias an-

lateral lobes theae differs in having distinctly larger flowers, more inconspicuous

well rounded the lower along the margin of the lip, as as broadly wings along mar-

gins of the stelidia.

2. The Trias is different from The genus only marginally Bulbophyllum. suppos- edly diagnostic 'horn' on the anther which distinctly protrudes beyond the front mar- gin of the anther is not unique to Trias, but occurs in a number of Bulbophyllum species as well. Besides, in Trias they are possibly not homologous in all species: in

the front of the anther is drawn whereas in e.g. T. oblonga Lindl. margin out, e.g.

of T. rosea and T. picta it is the ridge on the abaxial side the anther which is drawn

distinct 'horns' the mollis out. Only the presence of two on anther, as in T. (consist- ing of the front margin of the anther), T. intermediaand T. antheae (consisting ofthe ridge on the abaxial side of the anther) is a unique character within the Bulbophylli- nae. The Trias is best as section of it is main- genus regarded a Bulbophyllum. Here, tained only because a formal synonymization of the two genera reaches beyond the scope of this paper.

3. Named after Mrs. AntheaLamb, Tenom, Sabah.

REFERENCE

Vermeulen, J.J. 1991. Bulbophyllum. In: P.J. Cribb (ed.), Orchids of Borneo, Vol. 2. Bentham-

Moxon Trust, Royal Botanic Gardens, Kew & Toihaan Publishing Company Sdn. Bhd., Kota

Kinabalu.

Index

list: the referred the number in this B. (Alphabetical species are to given treatment; = Bulbophyllum)

B. dibothron 8 B. lohokii 4 B. tardeflorens 10

B. gilvum 3 B. lordoglossum 5 B. trulliferum 2

B. habrotinum 1 B. megalanthum 11 B. tryssum 6

B. hemiprionotum 7 B. muscohaerens 9 Trias antheae 12